126  Diastatio  Power  of  Extract  of  Malt.  {^arTh'S'""' 
and  apply  heat  whilst  stirriog  the  mixture^  until  the  combination  is 
completed.  Pour  the  solution  into  this  magma,  apply  heat,  and  when 
all  has  dissolved,  evaporate  the  solution  at  a  moderate  temperature,  to 
a  syrupy  consistence,  and  spread  it  on  glass  plates  to  dry  in  the  warm 
open  air,  so  that  the  salt  may  form  in  scales. 
THE  DIASTATIC  POWER  OF  CERTAIN  EXTRACTS  OF 
MALT. 
By  Albert  B.  Prescott. 
In  determining  the  starch-converting  power  of  certain  samples  of 
extract  of  malt  of  the  market,  these  samples  having  been  obtained 
since  December  1,  1884,  from  different  retail  drug  stores  in  different 
towns  in  the  interior  of  ]Michigan,  with  one  sample  of  each  brand 
obtained  in  Chicago,  Illinois,  I  have  obtained  the  following  given 
results : 
"maltine"  of  the  maltine  I 
manufacturinCt  company. 
No.  1  converts  9  to  10  jiarts  starch. 
No.  2       "  8 
No.  3       "       9  to  10  " 
No.  4       "  8 
No.  5       "  14 
No.  6       "  8 
No.  7       "  18 
Average  10  to  11  parts  starch. 
The  starch  -was  weighed  as  dry  starch,  and  rated  in  parts  to  one 
part  of  the  malt  extract.  The  concentration,  one  part  of  starch  to 
twenty  parts  of  water,  and  one  part  of  malt  extract  diluted  with 
water  to  four  parts.  The  time  of  digestion,  twenty  minutes;  the 
temperature,  60°  to  64°  C.  The  end-reaction,  an  extinction  of  the 
iodine  and  starch  color  in  three  minutes  after  the  intermixture  of  the 
iodine  with  the  digested  starch  (previously  cooled). 
One  year  ago,  using  the  same  method  and  conditions,  I  tested  the 
starch-converting  power  of  samples  of  Maltine  and  of  Trommer's 
Extract  of  Malt "  obtained  (in  open  market)  in  Ann  Arbor  only,  and 
then  found  and  reported  that  the  "  Maltine  converted  33  parts  of 
starch,  and  the  "  Trommer's  Extract  of  Malt "  converted  1 6  parts  of 
starch.    And  testing  now  again  my  retained  samples  obtained  a  year 
"  TROMMEU'S  EXTRACT  OF  MALT. 
No.  1  converts  18  parts  starch. 
No.  2      "       16  " 
No.  3       "  17 
No.  4       "  16 
Average,  16f 
